FLASHCARDIZZ - Neuromuscular Junction

Front

What is the neuromuscular junction?

Back

The neuromuscular junction is the location where a motor neuron connects to the sarcolemma (muscle cell membrane) of a muscle fiber, facilitating communication between the nervous system and muscles.

Front

What is the sarcolemma?

Back

The sarcolemma is the membrane that surrounds a muscle cell, playing a crucial role in muscle contraction by conducting electrical impulses.

Front

What neurotransmitter is responsible for stimulating skeletal muscle movement?

Back

Acetylcholine is the specific neurotransmitter that stimulates the movement of skeletal muscles by binding to receptors on the sarcolemma.

Front

How does a motor neuron initiate skeletal muscle contraction?

Back

A motor neuron sends a signal to the muscle cell, which triggers the release of neurotransmitters at the neuromuscular junction, leading to muscle contraction.

Front

What is released into the synaptic cleft to stimulate muscle contraction?

Back

Acetylcholine is released by axon terminals into the synaptic cleft to stimulate a muscle to contract.

Front

What role do neurotransmitters play in muscle contraction?

Back

Neurotransmitters, like acetylcholine, transmit signals from motor neurons to muscle fibers, initiating the contraction process.

Front

What is the synaptic cleft?

Back

The synaptic cleft is the small gap between the axon terminal of a motor neuron and the sarcolemma of a muscle fiber, where neurotransmitters are released.

Front

What happens to acetylcholine after it stimulates muscle contraction?

Back

After stimulating muscle contraction, acetylcholine is broken down by the enzyme acetylcholinesterase in the synaptic cleft to terminate the signal.

Front

What is the function of the motor neuron in muscle contraction?

Back

The motor neuron transmits electrical signals from the nervous system to the muscle fibers, initiating the contraction process.

Front

What is the role of calcium ions in muscle contraction?

Back

Calcium ions are released from the sarcoplasmic reticulum and bind to troponin, allowing actin and myosin to interact and cause muscle contraction.